Mask dispensing mechanism and mask vending machine

Abstract

The present invention provides a mask dispensing mechanism and a mask vending machine, the mask vending machine comprises a mask dispensing mechanism, a mask bin, a lifting mechanism and a rolling mechanism, masks are stacked in the mask bin, the mask dispensing mechanism is arranged above the mask bin, and is used to dispense the masks in the bin toward an outlet; the rolling mechanism is arranged downstream of the outlet, and is used to pull the masks out of the outlet; the lifting mechanism is used to lift the stacked masks upward so that the masks can contact with the mask dispensing mechanism. The mask vending machine of the present invention has the characteristics of simple structure, convenient use, and wide range of applicable product types.

Description

Technical Field

[0001] The present invention relates to the technical field of sanitary protection products, and in particular to a mask dispensing mechanism and a mask vending machine. Background Art

[0002] As people's knowledge of health care improves, they pay more and more attention to their own health protection. When going out, many people will wear simple protective products such as masks. At present, masks are divided into ordinary cotton masks, ordinary protective masks and medical masks. Some masks can be used multiple times after washing, and some are disposable masks. Cotton masks can generally be bought in supermarkets, shopping malls and other places, while disposable ordinary protective masks and medical masks can mostly only be bought in hospitals or pharmacies. When masks are needed, they can only be purchased in some fixed places. Therefore, it is very inconvenient for emergency situations. Summary of the invention

[0003] The technical problem to be solved by the present invention is: in order to overcome the deficiency of the prior art that it is inconvenient to buy masks, the present invention provides a mask dispensing mechanism and a mask vending machine.

[0004] The technical solution adopted by the present invention to solve its technical problem is: a mask dispensing mechanism includes a support plate, and a passive dialing mechanism and an active dialing mechanism are sequentially arranged on the support plate along the mask conveying direction, wherein the passive dialing mechanism includes a first pre-pressing roller, and the active dialing mechanism includes a second pre-pressing roller, the first pre-pressing roller is pressed at the rear end in the mask conveying direction, and the second pre-pressing roller is pressed at the front end in the mask conveying direction, and the rotation of the second pre-pressing roller can pull the mask to move toward the outlet direction under the action of friction force, and at the same time, the first pre-pressing roller is driven to rotate by the friction force between the first pre-pressing roller and the mask, and when the mask is separated from the first pre-pressing roller, the first pre-pressing roller stops rotating and presses on the lower mask.

[0005] The active toggle mechanism provides the power to pull out the mask through friction, and the passive toggle mechanism cooperates to complete the transportation of the mask. The friction force generated can be changed by adjusting the pressure between the first pre-pressing roller and the second pre-pressing roller and the mask, so as to be suitable for single-pack masks of different packaging sizes and thicknesses.

[0006] Furthermore, in order to achieve the clamping force between the first pre-stressing roller and the mask, the passive toggle mechanism also includes a first balance plate and a first spring. The number of the first springs can be one or more, determined according to the parameters of the spring and the elastic force that needs to be generated. The middle part of the first balance plate and the support plate are swingingly connected through a first swing point to form a seesaw structure. In the present invention, the first swing point is formed by a support seat and a rotating shaft, the rotating shaft is supported on the support seat, the first balance plate is rotatably connected to the rotating shaft, the first pre-stressing roller and the first spring are respectively located on both sides of the first swing point, and the first pre-stressing roller is rotatably connected to the first balance plate. The first spring is located between the first balance plate and the support plate, and at least one end is fixedly connected to the first balance plate or the support plate, and the other end is in a free state, or is connected to the support plate or the first balance plate. The "fixed connection" here means that the spring and the support plate or the first balance plate are relatively fixed, and the connection can be kept relatively fixed in position by an intermediate connecting member. Specifically, there are three connection modes. The first connection mode is that the upper end of the first spring is fixed below the first balance plate, and the lower end is not fixed to the support plate and is in a free state; the second connection mode is that the lower end of the first spring is fixed to the support plate, and the upper end is not directly connected to the first balance plate, but can only be supported below the first balance plate; the third connection mode is that the upper end of the first spring is fixed to the first balance plate, and the lower end is fixed to the support plate. The second and third modes are preferably used.

[0007] The passive toggling mechanism cooperates with the first pre-pressure roller and the first spring. When the upper mask is not pulled out and has not separated from the first pre-pressure roller, the first pre-pressure roller rotates to convey the mask; when the upper mask is pulled out and separated from the first pre-pressure roller, the first pre-pressure roller presses on the lower mask to prevent the lower mask from being pulled out due to the friction between the upper and lower masks.

[0008] Furthermore, in order to provide the power for dialing out, the active dialing mechanism also includes a second balance plate, a second spring and a roller driving mechanism. The number of the second spring can be one or more, determined according to the parameters of the spring and the elastic force to be generated. The middle part of the second balance plate and the support plate are swingingly connected through a second swing point to form a seesaw structure. In this embodiment, the second swing point is also formed by a support seat and a rotating shaft. The rotating shaft is supported on the support seat, and the second balance plate is rotatably connected to the rotating shaft. The second pre-stressing roller and the second spring are respectively located on both sides of the second swing point, and the second pre-stressing roller is rotatably connected to the second balance plate. The second spring is located between the second balance plate and the support plate, and at least one end is fixedly connected to the second balance plate or the support plate, and the other end is in a free state, or is connected to the support plate or the second balance plate. The meaning of "fixed connection" here is the same as in the previous text; the roller driving mechanism drives the second pre-stressing roller to rotate. The roller driving mechanism can be implemented in a variety of ways, and can be realized through transmission methods such as motors and gears, chains and belts. The present invention adopts a motor and belt transmission method, specifically including a motor, belt, driving pulley and driven pulley fixed on the second balance plate, the output shaft of the motor is connected to the driving pulley, the driven pulley is connected to the second pre-stressing roller, and the driving pulley and the driven pulley are connected by belt transmission, thereby driving the second pre-stressing roller to rotate.

[0009] Furthermore, in order to realize automatic action, the active toggle mechanism also includes a trigger switch. When the second balance plate swings around the second swing point, the trigger switch can act synchronously with the second balance plate to provide an electrical signal to start or stop the motor that drives the second pre-pressing roller to rotate. In the present invention, the trigger switch is arranged on the side close to the second spring. When the lifting mechanism lifts the stacked masks to a certain height, the second balance plate on this side tilts upward due to the force between the masks and the second pre-pressing roller, so that the other end of the second balance plate moves downward, driving the trigger switch to close, thereby triggering the motor to start, driving the second pre-pressing roller to start rotating through the belt assembly, and realizing automatic removal of the mask.

[0010] Specifically, in order to achieve contact between the roller and the mask, the support plate is provided with a first window matching the first pre-pressing roller, and a second window matching the second pre-pressing roller. The first pre-pressing roller passes through the first window and is pressed on the mask, and the second pre-pressing roller passes through the second window and is pressed on the mask.

[0011] A mask vending machine comprises the above-mentioned mask dispensing mechanism, and also comprises a mask bin, a lifting mechanism and a rolling mechanism, wherein the mask bin is arranged below the dispensing mechanism, the masks are stacked in the mask bin, and a bin outlet is provided on the downstream side of the mask bin in the mask conveying direction; the lifting mechanism is used to lift the masks stacked in the mask bin to make up for the distance between the top of the stacked masks and the dispensing mechanism, and to ensure the pressure and friction on the contact surface between the dispensing mechanism and the masks; the rolling mechanism is fixed downstream of the bin outlet, and can be fixed on the mask bin or on a support plate, and is used to roll the masks out of the bin outlet to the outside of the mask bin.

[0012] Specifically, the lifting mechanism includes a linear moving mechanism and a lifting plate, and the lifting plate is arranged on the linear moving mechanism and connected to the lifting plate, driving the lifting plate to move up and down in the mask bin. The linear moving mechanism is a power mechanism that can realize the up and down movement of the lifting plate, and there are many ways to realize it, including but not limited to linear guides, cylinders, etc., to realize the up and down movement of the lifting plate. In the present invention, a linear guide mechanism is used to realize the up and down movement of the lifting plate, specifically including a bracket, a motor, a gear transmission group, a lead screw and a linear guide. The bracket is arranged on one side of the mask bin, and the linear guides are vertically arranged on the bracket, and the two ends are fixedly connected to the bracket, and the lead screw is arranged in parallel on the outside of the linear guide, and the two ends are rotatably connected to the bracket through bearings, and one end thereof is connected to the motor through a gear transmission group, and the lead screw and the linear guide are connected through a slider, and one end of the lifting plate is also fixed on the slider, and can move synchronously with the slider. When the motor drives the lead screw to rotate through the gear transmission group, the slider can move up and down on the lead screw, thereby realizing the up and down movement of the lifting plate.

[0013] Furthermore, the unwinding mechanism includes a fixed roller, a support cover, a movable roller, a connecting plate, a tension spring and a roller driving mechanism. The support cover is relatively fixed to the mask bin; the fixed roller and the movable roller are arranged in parallel in front of the bin outlet, and are parallel or flush with the bin outlet. The two ends of the fixed roller are rotatably connected to the inner side of the support cover and are relatively fixed to the position of the mask bin. The connecting plate is divided into two left and right pieces. The two ends of the movable roller are respectively rotatably connected to one end of the left and right connecting plates. The other end of the connecting plate is rotatably connected to the support cover through a rotating shaft, and the connecting plate can rotate around the rotating shaft. The end of the connecting plate close to the movable roller is suspended on the support cover through a tension spring, and the tension spring generates a pulling force to make the movable roller close to the fixed roller, so that the contact pressure is generated between the two, and the friction force is increased. In addition, since one roller is in a non-fixed state, the mechanism is suitable for masks of different thicknesses and can be adjusted autonomously. The roller driving mechanism is connected to the fixed roller in a transmission manner to drive the fixed roller to rotate.

[0014] Furthermore, in order to enable the masks to be smoothly removed, the linear speed of the fixed roller is greater than or equal to the linear speed of the second pre-pressing roller to prevent the removed masks from piling up at the exit.

[0015] Furthermore, the rolling-out mechanism also includes a front baffle, which is covered above the active roller and the driven roller, and the end portion extends obliquely downward. A detection sensor is also provided above the front baffle to detect whether the mask is rolled out and provide feedback. On the other hand, it is tilted downward to facilitate the rolled-out mask to fall in the guided direction.

[0016] The beneficial effect of the present invention is that the mask dispensing mechanism and mask vending machine provided by the present invention have the characteristics of simple structure, easy use, and applicable to a wide range of product types. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0018] Figure 1 It is a structural schematic diagram of the mask vending machine of the present invention.

[0019] Figure 2 It is a top view of the mask vending machine of the present invention.

[0020] Figure 3 yes Figure 2 Schematic diagram of the cross-sectional structure of AA.

[0021] Figure 4 It is a structural schematic diagram of a mask dispensing mechanism.

[0022] Figure 5 It is a structural diagram of the inner side of the mask dispensing mechanism.

[0023] Figure 6 It is a top view of the mask dispensing mechanism.

[0024] Figure 7 yes Figure 6 Schematic diagram of the cross-sectional structure of BB.

[0025] Figure 8 It is a structural diagram of the lifting mechanism.

[0026] Fig. 9 yes Figure 1 Schematic diagram of the enlarged structure at point A in the middle.

[0027] In the figure: 1. mask bin, 11. bin outlet, 12. bin door, 13. guide plate, 2. mask dispensing mechanism, 21. support plate, 211. first window, 212. second window, 22. passive toggle mechanism, 221. first pre-pressure roller, 222. first balance plate, 223. first spring, 224. first swing point, 23. active toggle mechanism, 231. second pre-pressure roller, 232. second balance plate, 233. second spring, 234. trigger switch, 235. roller motor , 236, driving pulley, 237, driven pulley, 238, second swing point, 3, lifting mechanism, 31, lifting plate, 32, bracket, 33, lifting motor, 34, gear transmission group, 35, screw, 36, linear guide, 37, slider, 4, unwinding mechanism, 41, fixed roller, 42, support cover, 43, movable roller, 44, connecting plate, 45, tension spring, 46, front baffle, 461, detection switch placement area, 47, roller drive motor, 48, gear group, 49, rotating shaft. DETAILED DESCRIPTION

[0028] The present invention will now be described in detail with reference to the accompanying drawings. This figure is a simplified schematic diagram, which only illustrates the basic structure of the present invention in a schematic manner, and therefore only shows the components related to the present invention.

[0029] like Figure 1-Figure 2 As shown, a mask vending machine of the present invention comprises a mask bin 1, a mask extraction mechanism 2, a lifting mechanism 3 and a rolling mechanism 4. In this embodiment, masks are stacked in the mask bin 1, the mask extraction mechanism 2 is arranged above the mask bin 1, and is used to extract the masks in the bin toward the bin outlet 11; the rolling mechanism 4 is arranged downstream of the bin outlet 11, and is used to pull the masks out of the bin outlet 11; the lifting mechanism 3 is used to lift the stacked masks upward so that the masks can contact with the mask extraction mechanism 2.

[0030] like Figure 3 As shown, the mask bin 1 is provided with an outlet 11 on one side downstream of the mask conveying direction, and an inclined guide plate 13 is provided at the starting position inside the outlet 11 to make the opening at the entrance relatively large; a bin door 12 can be provided on the side of the mask bin 1 to facilitate the placement and replenishment of masks, and a cover plate can be set above the mask bin 1. In this embodiment, the support plate 21 can be used not only to support the mask dispensing mechanism 2, but also to serve as a cover plate of the mask bin 1.

[0031] like Figure 4-Figure 7As shown, the mask dispensing mechanism 2 includes a support plate 21, on which a passive dispensing mechanism 22 and an active dispensing mechanism 23 are sequentially arranged along the mask conveying direction, wherein the support plate 21 is provided with a first window 211 matching with a first pre-pressing roller 221, and a second window 212 matching with a second pre-pressing roller 231, the first pre-pressing roller 221 passes through the first window 211 and is pressed on the mask, and the second pre-pressing roller 231 passes through the second window 212 and is pressed on the mask.

[0032] The passive toggle mechanism 22 includes a first pre-stressing roller 221, a first balance plate 222 and a first spring 223. The middle part of the first balance plate 222 and the support plate 21 are swingably connected through a first swing point 224 to form a seesaw structure. In this embodiment, there is one first spring 223. The first swing point 224 is formed by a support seat and a rotating shaft. The rotating shaft is supported on the support seat, and the first balance plate 222 is rotatably connected to the rotating shaft. The first pre-stressing roller 221 and the first spring 223 are respectively located on both sides of the first swing point 224, and the first pre-stressing roller 221 is rotatably connected to the first balance plate 222. The first spring 223 is located between the first balance plate 222 and the support plate 21, and at least one end is fixedly connected to the first balance plate 222 or the support plate 21, and the other end is in a free state, or connected to the support plate 21 or the first balance plate 222. In this embodiment, the upper end of the first spring 223 is fixed to the first balance plate 222, and the lower end is fixed to the support plate 21. Both ends are fixed to make the structure more stable.

[0033] The active toggle mechanism 23 includes a second pre-load roller 231, a second balance plate 232, a second spring 233, a roller driving mechanism and a trigger switch 234. The middle part of the second balance plate 232 and the support plate 21 are swung and connected via a second swing point 238 to form a seesaw structure. In this embodiment, there is also one second spring 233, and the second swing point 238 is also formed by a support seat and a rotating shaft. The rotating shaft is supported on the support seat, and the second balance plate 232 is rotatably connected to the rotating shaft. The second pre-load roller 231 and the second spring 233 are respectively located on both sides of the second swing point 238, and the second pre-load roller 231 is rotatably connected to the second balance plate 232. The second spring 233 is located on the second balance plate 232 and the support plate 21, the upper end is fixedly connected to the second balance plate 232, and the lower end is fixedly connected to the support plate 21; the roller driving mechanism can adopt a variety of methods, and can be realized by transmission methods such as motors and gears, chains and belts. In this embodiment, a motor and belt transmission are coordinated, specifically including a roller motor 235 fixed on the second balance plate 232, a belt (not shown in the figure), a driving pulley 236 and a driven pulley 237, the output shaft of the roller motor 235 is connected to the driving pulley 236, the driven pulley 237 is connected to the second pre-pressure roller 231, and the driving pulley 236 and the driven pulley 237 are connected by belt transmission, thereby driving the second pre-pressure roller 231 to rotate.

[0034] When the second balance plate 232 swings around the second swing point 238, the trigger switch 234 can act synchronously with the second balance plate 232 to provide an electrical signal to start or stop the motor driving the second pre-pressing roller 231. In this embodiment, the trigger switch 234 is arranged on a side close to the second spring 233. When the lifting mechanism 3 lifts the stacked masks to a certain height, the second balance plate 232 on this side tilts upward due to the force between the masks and the second pre-pressing roller 231, so that the other end of the second balance plate 232 moves downward, driving the trigger switch 234 to close, thereby triggering the motor to start, driving the second pre-pressing roller 231 to start rotating through the belt assembly, and pulling out the mask.

[0035] When the mask is pulled out, the first pre-pressing roller 221 is pressed on the rear end of the mask conveying direction, and the second pre-pressing roller 231 is pressed on the front end of the mask conveying direction, and the rotation of the second pre-pressing roller 231 can pull the mask to move toward the outlet 11 under the action of friction. At the same time, the first pre-pressing roller 221 is driven to rotate by the friction between the first pre-pressing roller 221 and the mask. When the mask is separated from the first pre-pressing roller 221, the first pre-pressing roller 221 stops rotating and presses on the lower mask. The passive toggling mechanism 22 cooperates with the first pre-pressing roller 221 and the first spring 223. When the upper mask is not pulled out and is not separated from the first pre-pressing roller 221, the first pre-pressing roller 221 rotates to convey the mask; when the upper mask is pulled out and separated from the first pre-pressing roller 221, the first pre-pressing roller 221 presses on the lower mask to prevent the lower mask from being brought out due to the friction between the upper and lower masks.

[0036] like Figure 8 As shown, the lifting mechanism 3 is used to lift the masks stacked in the mask bin 1 to make up the distance between the top of the stacked masks and the extraction mechanism, and to ensure the pressure and friction between the extraction mechanism and the contact surface of the mask. The lifting mechanism 3 includes a linear moving mechanism and a lifting plate 31, and the lifting plate 31 is arranged on the linear moving mechanism and connected to the lifting plate 31, driving the lifting plate 31 to move up and down in the mask bin 1. The linear moving mechanism can use a linear guide 36 or a cylinder to realize the up and down movement of the lifting plate 31. In this embodiment, a linear guide 36 mechanism is used to realize the up and down movement of the lifting plate 31, which specifically includes a bracket 32, a lifting motor 33, a gear transmission group 34, a screw 35 and a linear guide 36. The bracket 32 ​​is arranged on one side of the mask warehouse 1, and the linear guides 36 are vertically arranged on the bracket 32, and both ends are fixedly connected to the bracket 32. The screw 35 is arranged in parallel on the outside of the linear guide 36, and both ends are rotatably connected to the bracket 32 ​​through bearings, and one end is connected to the motor through the gear transmission group 34. The screw 35 and the linear guide 36 are connected through a slider, and one end of the lifting plate 31 is also fixed on the slider, which can move synchronously with the slider. When the motor drives the screw 35 to rotate through the gear transmission group 34, the slider can move up and down on the screw 35, thereby realizing the up and down movement of the lifting plate 31.

[0037] like Figure 1 and Figure 3As shown, the rolling mechanism 4 is fixed downstream of the outlet 11, and can be fixed on the mask bin 1, or fixed on the support plate 21, and is used to roll the mask out of the outlet 11 to the outside of the mask bin 1. The rolling mechanism 4 includes a fixed roller 41, a support cover 42, a movable roller 43, a connecting plate 44, a tension spring 45, a front baffle 46 and a roller drive mechanism. The support cover 42 is relatively fixed to the mask bin 1. The support cover 42 is a U-shaped cover plate, and the opening faces downward. Both sides of the opening are fixed on the support plate 21 or the mask bin 1. The U-shaped cover plate is covered on the roller drive mechanism to protect it; the fixed roller 41 and the movable roller 43 are arranged in parallel in front of the outlet 11, and can float up and down in a position parallel to the outlet 11, or be flush with the outlet 11 and located on the same horizontal line. Both ends of the fixed roller 41 are rotatably connected in the support cover 42. side, and is relatively fixed with respect to the position of the mask bin 1. The connecting plate 44 is divided into two left and right pieces. The two ends of the movable roller 43 are rotatably connected to one end of the left and right connecting plates 44 respectively. The other end of the connecting plate 44 is rotatably connected to the support cover 42 through a rotating shaft, and the connecting plate 44 can rotate around the rotating shaft. The end of the connecting plate 44 close to the movable roller 43 is suspended on the support cover 42 through a tension spring 45, and the tension spring 45 generates a pulling force to make the movable roller 43 close to the fixed roller 41 so that contact pressure is generated between the two, thereby increasing the friction force. In addition, since one roller is in a non-fixed state, the mechanism is suitable for masks of different thicknesses and can be adjusted autonomously. The roller drive mechanism is connected to the fixed roller 41 in transmission to drive the fixed roller 41 to rotate. The roller drive mechanism can also be implemented in a variety of ways. In this embodiment, a roller drive motor 47 and a gear set 48 are used to drive the fixed roller 41. The gear set 48 can facilitate the change of the speed ratio. Its specific connection method is a conventional method, see Figure 1 As shown in , it will not be described here. The front baffle plate 46 is arranged above the active roller and the driven roller, and the end portion extends obliquely downward. A detection switch placement area 461 for installing a detection switch is also provided above the front baffle plate 46 to facilitate detection of whether the mask is rolled out. In order to enable the mask to be smoothly pulled out, the linear speed of the fixed roller 41 is greater than or equal to the linear speed of the second pre-pressure roller 231 to prevent the pulled out masks from piling up at the outlet 11. In this embodiment, in order to reduce the weight of the components, weight-reducing holes can be provided on the components, such as: weight-reducing structures can be provided on the support plate 21, the lifting plate 31, the support cover 42 and the front baffle plate 46.

[0038] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the scope of the present invention through the above description. The technical scope of this invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A mask vending machine, characterized in that: It includes a mask dispensing mechanism, a mask bin, a lifting mechanism and a rolling mechanism, wherein the mask bin is arranged below the mask dispensing mechanism, the masks are stacked in the mask bin, and a bin outlet is arranged on one side of the mask bin located downstream in the mask conveying direction; the lifting mechanism is used to lift the masks stacked in the mask bin; the rolling mechanism is fixed downstream of the bin outlet, and is used to roll the masks out of the bin outlet to the outside of the mask bin; The unwinding mechanism includes a fixed roller, a support cover, a movable roller, a connecting plate, a tension spring and a roller driving mechanism. The support cover is relatively fixed to the mask bin; the fixed roller and the movable roller are arranged in parallel in front of the bin outlet, and both ends of the fixed roller are rotatably connected to the inner side of the support cover. The connecting plate is divided into two left and right pieces. Both ends of the movable roller are rotatably connected to one end of the left and right connecting plates respectively, and the other end of the connecting plate is rotatably connected to the support cover through a rotating shaft, and the connecting plate can rotate around the rotating shaft. The end of the connecting plate close to the movable roller is suspended on the support cover through a tension spring, and the tension spring generates a pulling force to make the movable roller close to the fixed roller; the roller driving mechanism is transmission-connected to the fixed roller to drive the fixed roller to rotate.

2. The mask vending machine according to claim 1, characterized in that: The mask dispensing mechanism includes a support plate, and a passive dialing mechanism and an active dialing mechanism are sequentially arranged on the support plate along the mask conveying direction, wherein the passive dialing mechanism includes a first pre-pressing roller, and the active dialing mechanism includes a second pre-pressing roller, the first pre-pressing roller is pressed at the rear end in the mask conveying direction, and the second pre-pressing roller is pressed at the front end in the mask conveying direction, and the rotation of the second pre-pressing roller can pull the mask to move toward the outlet direction under the action of friction force, and at the same time, the first pre-pressing roller is driven to rotate by the friction force between the first pre-pressing roller and the mask, and when the mask is separated from the first pre-pressing roller, the first pre-pressing roller stops rotating and presses on the lower mask.

3. The mask vending machine according to claim 2, characterized in that: The passive toggle mechanism also includes a first balance plate and a first spring. The middle portion of the first balance plate and the support plate are swingably connected via a first swing point. The first pre-pressure roller and the first spring are respectively located on both sides of the first swing point, and the first pre-pressure roller is rotationally connected to the first balance plate. The first spring is located between the first balance plate and the support plate, and at least one end of the first spring is fixedly connected to the first balance plate or the support plate, and the other end is in a free state, or is connected to the support plate or the first balance plate.

4. The mask vending machine according to claim 2 or 3, characterized in that: The active toggle mechanism also includes a second balance plate, a second spring and a roller drive mechanism. The middle portion of the second balance plate and the support plate are swingably connected via a second swing point. The second pre-load roller and the second spring are respectively located on both sides of the second swing point, and the second pre-load roller is rotationally connected to the second balance plate. The second spring is located between the second balance plate and the support plate, and at least one end of the second spring is fixedly connected to the second balance plate or the support plate, and the other end is in a free state, or is connected to the support plate or the second balance plate; the roller drive mechanism drives the second pre-load roller to rotate.

5. The mask vending machine according to claim 4, characterized in that: The active toggle mechanism also includes a trigger switch. When the second balance board swings around the second swing point, the trigger switch can act synchronously with the second balance board to provide an electrical signal for starting or stopping the motor that drives the second pre-pressure roller to rotate.

6. The mask vending machine according to claim 2, characterized in that: The support plate is provided with a first window matching with the first pre-pressing roller and a second window matching with the second pre-pressing roller. The first pre-pressing roller passes through the first window and is pressed on the mask, while the second pre-pressing roller passes through the second window and is pressed on the mask.

7. The mask vending machine according to claim 1, characterized in that: The lifting mechanism includes a linear moving mechanism and a lifting plate. The lifting plate is arranged on the linear moving mechanism and connected with the lifting plate to drive the lifting plate to move up and down in the mask bin.

8. The mask vending machine according to claim 7, characterized in that: The linear speed of the fixed roller is greater than or equal to the linear speed of the second pre-pressing roller.

9. The mask vending machine according to claim 7, characterized in that: The rolling-out mechanism also includes a front baffle, which is arranged above the active roller and the driven roller, and the end of the front baffle extends obliquely downward. A detection sensor is also provided above the front baffle to detect whether the mask is rolled out.

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